Put a gamelogic
put the following in init of logic
{_x setDammage (0.2+random 0.8)} foreach (nearestObjects [this,["STATIC"],100])
The radius in this case is 100m.
You can now copy & paste that gamelogic to other places where you want destruction.
To exclude objects,just do what SaOk have described.
Also : i'm not sure that the brackets ( and ) are required for nearestobj.......IC"],100]
remove them if you get errors.
Just showing a simpler way in which you don't need to have names.
For timed destruction, just put the code in On Act box of the first waypoint of the logic.
(Adjust time in the waypoint)
Regards,
Haroon1992